Measurements of transverse lateral and longitudinal angular shifts of high-azimuthal-mode Laguerre-Gaussian beams reflected at a dielectric interface near critical incidence

Miki Sato, Hiroyuki Sasada

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Laguerre-Gaussian (LG) beams with a radial mode index p = 0 and azimuthal mode indices l from -5 to 5 are reflected at a glass-air interface near critical incidence, and the transverse lateral and longitudinal angular shifts of the intensity center of gravity are measured relative to the LGp=0,l=0 beam. The LG beams are generated with a programmable spatial light modulator that displays computer-generated holograms encoding phase and amplitude information. The measured relative shifts are greatly enhanced near the critical angle and agree with the theoretical values numerically calculated using the wavenumber-space representation.

Original languageEnglish
Article number014018
JournalJournal of Optics (United Kingdom)
Volume15
Issue number1
DOIs
Publication statusPublished - 2013 Jan

Fingerprint

Gaussian beams
incidence
shift
Holograms
Gravitation
center of gravity
light modulators
Glass
coding
Air
glass
air
Spatial light modulators

Keywords

  • Beam shift
  • critical incidence
  • Laguerre-Gaussian beam
  • orbital angular momentum
  • reflection

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics
  • Electronic, Optical and Magnetic Materials

Cite this

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abstract = "Laguerre-Gaussian (LG) beams with a radial mode index p = 0 and azimuthal mode indices l from -5 to 5 are reflected at a glass-air interface near critical incidence, and the transverse lateral and longitudinal angular shifts of the intensity center of gravity are measured relative to the LGp=0,l=0 beam. The LG beams are generated with a programmable spatial light modulator that displays computer-generated holograms encoding phase and amplitude information. The measured relative shifts are greatly enhanced near the critical angle and agree with the theoretical values numerically calculated using the wavenumber-space representation.",
keywords = "Beam shift, critical incidence, Laguerre-Gaussian beam, orbital angular momentum, reflection",
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AB - Laguerre-Gaussian (LG) beams with a radial mode index p = 0 and azimuthal mode indices l from -5 to 5 are reflected at a glass-air interface near critical incidence, and the transverse lateral and longitudinal angular shifts of the intensity center of gravity are measured relative to the LGp=0,l=0 beam. The LG beams are generated with a programmable spatial light modulator that displays computer-generated holograms encoding phase and amplitude information. The measured relative shifts are greatly enhanced near the critical angle and agree with the theoretical values numerically calculated using the wavenumber-space representation.

KW - Beam shift

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KW - Laguerre-Gaussian beam

KW - orbital angular momentum

KW - reflection

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